Would a check valve work and if so, where should I put it?

[ericm979]

Since the same amount of fluid is leaving the tank as is entering it, the only pressure build up is from the air above the fluid heating up and fluid expansion from heat. Not going to get a lot of pressure from that especially compared to hydraulic pressures. I think Oldnslo's explanation is a logical one.

 

[SylvainG]

Sylvain
Do you have a FEL valve on your tractor?

if yes then plumbing should be from power beyond of FEL valve to inlet of new valve. Power beyond of new valve to 3PH

tank of new valve teed into tank line of FEL valve.

suspect reason handle moves on current valve is that with work ports blocked leakage builds pressure in A which is intended to push handle out of detent.

Yes, I have a FEL. When I used my box grader, both A and B port when left unplug (ie, nothing attached to them) so there was no pressure coming from the A port. When I raised the grader, the valve moved up (as if being kicked by the auto return). Only the P and T ports were connected. P is already from the FEL PB port and T is going to a port called "R PORT (Carry-Over Port Of The Exterior Implement)" on my auxiliary relief valve (if that's its name, it where the pump, tank and FEL connects to).

 

[oldnslo]

Sylvain,
When you raise the grader on the 3PH you pressurizing the tank port and pressure port of your blower chute valve. The spool leakage on the blower chute valve would create pressure in the A port and B port since they are blocked.

If you have enough pressure in your reservoir to shift the spool you would not have a transmission housing since it would be split or all of your shaft seals would be leaking.

 

[SylvainG]

So, what's going on then?

These contradicting diagrams are for the auxiliary block in the same Kioti service manual.

This one shows the ports and how the switch controls if the external implement is hydro fed (ie, FEL, etc) but in that position the 3PH isn't being fed any fluid! What?

But in this diagram of the same auxiliary block later in the manual, it shows port C being connected to the same port as the 3PH which would in theory send fluid to the 3PH, so if it's legit and since my splitter valve T port is connected there, could it explain why I'm seeing pressure there when I move the 3PH and if so, would a check valve there prevent the pressure from reaching back the splitter valve tank port?

 

[LD1]

Fire your dealer and replace the valve with one that has PB. Do it right.

You should NEVER need a check valve on a tank line.....because tank line should NEVER have pressure.

Your tank line coming out of that new valve is seeing pressure because it's feeding the pressure side of the 3ph.

Backhoes added to the back of these compact tractors skate around needing PB valves because you cannot use the 3ph when the hoe is connected. So the simple open center non-pb backhoe valve comes out of the tank port.....into the P of the 3ph (which is also open center) and right back to tank.

Most of your tractor manuals or backhoe attachment manuals will specifically caution you to NOT move the 3ph lever when hoe is attached or damage might occur.

 

[SylvainG]

What puzzles me is the contradicting diagram. I'm not sure if that port the valve T port connects to is seeing pressure or not. One diagram says it's a tank port and the other says it's a pressure port. Plus, I'm not sure if that port on the auxiliary block was used before he installed the valve (and where) or if it was capped. I think I'll ask in the Kioti forum for someone with a LK30/LK3054 with a FEL/Backhoe without a remote if he can show me a picture of his auxiliary block.

As for the 3PH damaging the backhoe, that's why I put the wingnut (used to limit how low the 3PH will drop) on the top side of the lever so I don't raise it by mistake.

 

[LD1]

I'm not sure other. But normally....on a basic tractor with nothing more than a loader and 3ph......the flow goes as follows.....

Pump→loader valve. Out of loader valve power beyond →pressure inlet for 3ph. Out of 3ph tank port →tank.

Usually the tank return for the 3ph isn't a physically port or hose. It simply drains inside the case/rear axle housing.

But coming out of the loader PB is a hose.....usually goes to a manifold block.....that supplies pressure to the 3ph.

This line is usually where a 3rd or remotes are installed. Spliced in series. By doing so.....it needs TWO outlets. One no pressure return to tank. Another high pressure PB to continue to feed the 3ph.

Only the last valve inline doesn't need PB. Or most electric valves that mount to a sub plate.....don't need one either....because their tank ports are usually rated for full pressure

 

[SylvainG]

Mine seems to be connected differently. I'll wait for a picture from the Kioti forum and if I get no reply, I'll disconnect that hose and connect my pressure gauge to it and see what pressure it sees when moving the 3PH.

Thanks for your help

 

[LD1]

Mine seems to be connected differently. I'll wait for a picture from the Kioti forum and if I get no reply, I'll disconnect that hose and connect my pressure gauge to it and see what pressure it sees when moving the 3PH.

Thanks for your help

How is yours connected. Or rather how WAS it connected before your dealer butchered it?

 

[SylvainG]

I don't know. Bought it like that.

That's what I asked in the Kioti forum. @Crazed98Camaro answered me and will send me pictures of how it's connected on its 1997 KL3054.